[Intel-gfx] [PATCH v2] drm/i915: Don't apply the 16Gb DIMM wm latency w/a to BXT/GLK

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

The 16Gb DIMM w/a is not applicable to BXT or GLK. Limit it to
the appropriate platforms.

This was especially harsh on GLK since we don't even try to read
the DIMM information on that platforms, hence valid_dimm was
always false and thus we always tried to apply the w/a.
Furthermore the w/a pushed the level 0 latency above the
level 1 latency, which doesn't really make sense.

v2: Do the check when populating is_16gb_dimm (Mahesh)

Cc: Mahesh Kumar <mahesh1.kumar at intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Fixes: 86b592876cb6 ("drm/i915: Implement 16GB dimm wa for latency level-0")
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 15 ++++++++-------
 drivers/gpu/drm/i915/i915_drv.h |  1 -
 drivers/gpu/drm/i915/intel_pm.c |  3 +--
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index baac35f698f9..6571044c9286 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1165,8 +1165,6 @@ skl_dram_get_channels_info(struct drm_i915_private *dev_priv)
 		return -EINVAL;
 	}
 
-	dram_info->valid_dimm = true;
-
 	/*
 	 * If any of the channel is single rank channel, worst case output
 	 * will be same as if single rank memory, so consider single rank
@@ -1183,8 +1181,7 @@ skl_dram_get_channels_info(struct drm_i915_private *dev_priv)
 		return -EINVAL;
 	}
 
-	if (ch0.is_16gb_dimm || ch1.is_16gb_dimm)
-		dram_info->is_16gb_dimm = true;
+	dram_info->is_16gb_dimm = ch0.is_16gb_dimm || ch1.is_16gb_dimm;
 
 	dev_priv->dram_info.symmetric_memory = intel_is_dram_symmetric(val_ch0,
 								       val_ch1,
@@ -1304,7 +1301,6 @@ bxt_get_dram_info(struct drm_i915_private *dev_priv)
 		return -EINVAL;
 	}
 
-	dram_info->valid_dimm = true;
 	dram_info->valid = true;
 	return 0;
 }
@@ -1317,12 +1313,17 @@ intel_get_dram_info(struct drm_i915_private *dev_priv)
 	int ret;
 
 	dram_info->valid = false;
-	dram_info->valid_dimm = false;
-	dram_info->is_16gb_dimm = false;
 	dram_info->rank = I915_DRAM_RANK_INVALID;
 	dram_info->bandwidth_kbps = 0;
 	dram_info->num_channels = 0;
 
+	/*
+	 * Assume 16Gb DIMMs are present until proven otherwise.
+	 * This is only used for the level 0 watermark latency
+	 * w/a which does not apply to bxt/glk.
+	 */
+	dram_info->is_16gb_dimm = !IS_GEN9_LP(dev_priv);
+
 	if (INTEL_GEN(dev_priv) < 9 || IS_GEMINILAKE(dev_priv))
 		return;
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 22cf3c75558c..2d7761b8ac07 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1933,7 +1933,6 @@ struct drm_i915_private {
 
 	struct dram_info {
 		bool valid;
-		bool valid_dimm;
 		bool is_16gb_dimm;
 		u8 num_channels;
 		enum dram_rank {
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 67a4d0735291..faef7f528269 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2881,8 +2881,7 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv,
 		 * any underrun. If not able to get Dimm info assume 16GB dimm
 		 * to avoid any underrun.
 		 */
-		if (!dev_priv->dram_info.valid_dimm ||
-		    dev_priv->dram_info.is_16gb_dimm)
+		if (dev_priv->dram_info.is_16gb_dimm)
 			wm[0] += 1;
 
 	} else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
-- 
2.18.1